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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '262df5631e950e8cfbe2a805be019ca419e31c97a6c3577445e739ecac2ff77d' 
  AND token = 'v/uRw7QXKwtT2vW5ZENfQ8LLbQTVYMJuXQaomdNCrJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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