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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7e795fed13577624975d965227b86a6b4fb6cdf9a053c0c99925bbb79599308' 
  AND token = 'wcHjkvIAQqjgHzMSCNfWrwNoUGCKri6D6wd5NA46xdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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