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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34d8f7495f8851fed7d05ad09e715439659d8bb4b5f84a36a5da2468abfb8894' 
  AND token = '9aiQPcrnGZchu98Y03xidG+b5jHXNcP2OaOvxi1TlAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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