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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42ceba55d8e9518ffc8309a3b36110b6edaaa0fd1150c7db094031651fed4908' 
  AND token = 'T7S/l0jHb4Odb5bCXA6MsD8bEdort2BOD2Tsb0Oskv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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