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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b0412a63f5c150254a2bfc848e6eb2da52921a7e890f36bfcc90f3bf1953b29' 
  AND token = 'eDf8WBOnKGFEmbc7A18235PaTZpl3El9lvpMh5axzPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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