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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ccba0535d31e4ea55fe75afdac45e842d6d9ef7453232b41533bd1e08ff012a' 
  AND token = 'YiYD9WFxj0JFX2LatENMN2Oy09rq/hbRnakQjcBFLk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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