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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97105d304d62a99a3f448da1da85e893282c09e5f00f9581c14e0a4bdb8ab73b' 
  AND token = 'd7X2zdnM7LUlOBxDPi9BDBWpMB95yV2yki9aDbQjmbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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