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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e0464ccbea1e01af45fc821a95487098113404d26303a71188cd32fc16356f3' 
  AND token = 'oRAgHzt0QYw6gaGc6sPcvqY765V945P9e4fUdmdvc50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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