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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec8eab64e924448ccc078d8960003ef07bf516ebc9466589dcc5c5ab7d53ee25' 
  AND token = '56dz/rOHT5GmUjEROSgAYMWsQBX8zV+UOA8VtATDTXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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