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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '825ea3aa7122c2691a25ec65031fee6e950098712b75beeea6768797e7897811' 
  AND token = 'XcUJK4QjYwi5u6T7/TsFwXnnrY+Icel17yObAYmW8zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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