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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6787dad82c77e4c25bb49da684d87517bc91c16e8b7925b8a4c11e49131d1764' 
  AND token = 'Kd55Sii3AT0JvffSLJ+zhRcChU1ZuECvv86fldAl38U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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