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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93bbca6ac10222a482c8f6c0e9ceb45cfa2d62caf9911f8e9de95f3f431cc442' 
  AND token = 's6tgzq+LjKPmKQbNJHmCIgqmN53lrLAcGxF2FYMCyrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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