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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbcb5f5646a99f7ff5f65ad5385f8c8a4bb47c16c90402810debaf0bde195e29' 
  AND token = 'dlCEgFnDUMc1o/u9QYo23YNdqroyEi3wKF8ClgJ4h94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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