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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c609144b9485ce62ee0e0e3577318c6e548abc15147bafca27091d2c82cc78a' 
  AND token = 'uAezfbj616hdlk/54eveWB8iDuZHlf4p8i4WEYLys+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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