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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e617da50faa4d963dfb44a674a35af594078e33d91e81362eaa82ca8cffa84e' 
  AND token = 'CZ55bCORYoBoEnSHu3qr0ND0b4sktPAbmDv8vszp+Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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