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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '105ee65086ee2fbc819cff0c43b938946980cc11d4e13b446abb7ee231ade431' 
  AND token = '/guiiBLDi1qjVo67qIvkHLY8e1C10h558TA6ShXuxZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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