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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9bbadaa949f57bed3c98095b5d7517d1bedbaad88059f21396a3d4cd4cb8858' 
  AND token = 'Y7PSKTJi/+N30f9gpYe54LPEH9NoEgZTia8ts2IitGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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