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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a18a2e700ae858ade1f256b9af62b0b02f3ba3a45d1d626b2deb7e206b9ded46' 
  AND token = 'sYXhaqIv/vacCaNB4WEJk6h5Z8FGKbVoWNiyYMD7UbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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