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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e601170aaa819a834cfe9ea81d64fdd59e9e0d26e4b90f7f0fb75df8d35c464' 
  AND token = 'Y9ZynB1YnUcH50wyF0lfC2Irr8QFU0pPzXI6MFygmds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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