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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5d1ff4c9feaf9a4a05a649a390778b04dee37724d7d292dd8fdc1705588531b' 
  AND token = 'h47i/4ETsL9IOlcg48ZyOgO4de2JMdENxWYIPhQfS6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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