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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd43546d43af6559f864e842c57fc34f8120c31a5aedc16e9e602cd2cc5f8c29c' 
  AND token = '6D8tcSJ/nENkkZiLMedD8vIo+R2XY7Z3zCyUWpOG2es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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