SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7814afa9cb36cb599e41572f3b437d39a8b9da5135b1410d678dc61b63ebdf' 
  AND token = 'j5yxov2LeDYSqkFni8g/LNX9b/Rm3hgXojO9ZLqDf6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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