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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52b67132c575be7c09b1aebff170e37a9991073537049b5a9f3ed776caa8eda8' 
  AND token = 'zC7sNtiBM2QbAdqYlymoF9Jrlm47R9FC5HHsfmjxNcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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