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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6139bf180698e8435cb37cb23049c3814fa50e9ff5789fa17fd8906383d6e1b0' 
  AND token = '1eRhP1vdEhMVtfhfAtRJh3vIFIwtsiW+VHDaZ+zDbvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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