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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b60e33a067ae610f95ecb4aa89e70be11d47bfff1a9c17e15c25a8c981c24423' 
  AND token = '/vE63bdIWicU7elsxYnYoc7m33MLEedkEA3zj9qCUYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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