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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01733e363e9644b90b639fba5fcc5dce3646dda3cd893bb989a8640eac47f712' 
  AND token = '4ftKJvxDEU9/pRqOX2I7nQu1ieUXE9TwVh2YixfzWe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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