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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4acfd77e44068c77372e3d0960849b2efc0fbb80194e9e3193e673286ac6f68d' 
  AND token = 'KWAQ793frNW2nT8cwBYOl9KnsxQtps3aCPDxDxLKXVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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