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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd768fbe159709e99cb03e5fe010fddb4d60ca41a23b825577e8e9bf78bb8e405' 
  AND token = 'KLe+oh56NU2dfPUnoGy8ri5jTcIBEiTPi/ugUWrekT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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