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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e7689699911780d0a1d8fa3cbe5d16b9c4af9a08be0a51c1466c76ce6512ca8' 
  AND token = 'DLQrH9pUAUtN+BbJtpjHQpMvJXRcdMYg5suUZf8sW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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