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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edeee43e3115fb7e621a19f7c7b81b041adebd720da78709a477653155a09230' 
  AND token = 'e4g5tWIOlUgPK0Yc8eXq8TWhELTNaZoXJ4QEMTt9ESw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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