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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e67550b5578cff7002ab535dc918fdc987c68fba8f552856436166c497e2706' 
  AND token = 'RolmG64t2MBOYBFUXtnOXdBLKbeC12MV09EHY1PyheM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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