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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b66693063821b8333be390eeb4844e6d6b6dcf4a4087ae1d3ba6ea3dc1b447c' 
  AND token = 'BNrc9Plu3QQw1k3AzBOVXfqpGQfkYCkcruzSc5tMSc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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