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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '883afdd1eff159b31d1d8d43d238b72e05f26a5d8fe0bf056f3899085592fd90' 
  AND token = '6vbVf9KROXXrL9P+uqWUijzzkva8tWdmg4PYKOKaefM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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