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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '544ff7fedeb697e3dd5c3acd5cda53d8d24dcb3edf25708bb2c049be48212e72' 
  AND token = 'gDfowCnqO5+EwNMFPojLdigLEP8c6ad7iAioHcn6AW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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