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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98069bac5323441fd2e469eb0fc002299dd12214bbbb4e620e58075b346c445' 
  AND token = 'QDKi+MxUDRbGgRv1U1P5WRGYjRQiHJIQ06GmxssN26k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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