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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c29c5404188b0e7a50c3cf0a33ca6ec53325b5f2799f3c7a9af008eb3098bf7' 
  AND token = '8hOQXPI9/EEyRhx6a0ZN6KAc0a+7mqOE8yjUobf6akU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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