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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c190a829b7bf42761b1ac889b29ed0b3dd5e4d7058474ea816d759b7605e91' 
  AND token = 'bVlCcMeFfnsqQRbEtgU0pl2x7WbsnDwofUjpmY0XIz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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