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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81fd2c7c3415a8799aa8c99f9a697b5580588bf4fef74472311e54e6113ff2b7' 
  AND token = 'VUToQprI80TbEpeRrbkheCm+y2z+i2wfcqFwc49ukAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}