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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f345b69b088dad1bd4e20fa1ab1bb775934ad1438ed296fb212a0495f4ac1c9' 
  AND token = '7wqDhvD+cK93i7qwn55SEI6s46Lc0tVUNpTmq512RH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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