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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a35d0a87fae130cea50e248ac53d2e9ea499ff0b24ceee9fe02178f2ca6871b0' 
  AND token = '2KEPcaLTh88qLg0nMXtiE6Vz4F6uz8ink9kr5QI7vBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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