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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5e26d3ab21e19c1de1c2ce46daaa0f9b48af51c292616e9ecdfbaca2aa7a409' 
  AND token = '9oPjM9C+yV89w1cyn+pLK07ovNOTqUBXF1EV4+sa/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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