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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aaa1ddba5b35469a45d443fb82abe6830ad6e8170ff96e7b59d93f3d5cbe03b' 
  AND token = 'pTv7hU3t45pgOx7dRsIf/8FgCnPVcP1qPfuVy2wutN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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