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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b41189a65f1fc1599850ddd8b41e5757f5d0d0dd5696036b8d43ac48e3970dec' 
  AND token = '4gUIIL5J1n2GQjO32cr6zv570Verj2+5E9blw7ae/F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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