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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02a0e33ad49d43bd29363c66c71e97e49cb8e172934baf13969c4eaf71401338' 
  AND token = 'hNhAQ8rHOuJlbXyvqWN4tHOL2HZe42uQ9hF7ywQj0O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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