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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ad21055fe265a3fdd4d438754ae13e055eee0d0c271ad4900cead0ba413d3a6' 
  AND token = '4W1KYMKNTt9jCZtVxwI4YDj3y49rjZ6nHqVFmHK5Ozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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