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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd4d71a83ed39d2c394238e1261a41093468e4b8e2c4a125ea33b1c0290b3e7b' 
  AND token = '4Z0g/jsjxHV1no6pmQMchPi9KUNMrjpeui13uhHdAJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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