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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e4885addaf92a92a97bd9f97d17a1c9e21b559f75f557fe16838e29524e1e79' 
  AND token = 'NrYcI7AR1xu/RfOSTE+E37ZKiz2lznvecs97CSZ+NYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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