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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f7491d25e48bedc04cda905ed5621dbb2d6061e0b5d284012a9482dd473d44b' 
  AND token = 'tCcA5XrKcDVU0oH9ooH7KwsrMPGYZewxM7CunMUi5mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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