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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c99f10e682cd722b382f9ce4a43034bb972562126b843769e2a3a672b694d753' 
  AND token = 'kEbMh23bucSe53NVEeZ+MCm2IdlxJxVwZ5RoVNWjg6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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