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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead0d2eaa57146435481e934c3b53f8349ea0de46ecaa6b78ca48a4378e006fd' 
  AND token = 'Gjbciiz4SLaDdtpqq7js7JEwJHJI1lE3yDJIXV6j5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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