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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12f6f40a15f8c0c9bfb18cde083031f9ccd4ddf694132cf7deda460389efa207' 
  AND token = 'aEbfaynkt8+M9c1e5ZkR/jcDr/mnYjhCEvnARercQjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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