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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4bfcc03d220888533ca2dc2b1ac058214006e8d5d7e321fff01d19a31fb3aca' 
  AND token = 'uxvttTo6K3/7+YGVXd1drntgaHhwViN9lYNe2KoUd2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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