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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5dea914ecc4f1f2b5b8afffc0d77e70c74decb5cf5975999366cdbbc5c56039' 
  AND token = 'zVxpqFPIArktRP7Ge5SevDFBmBHhYfIXJ11K7iKVV9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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