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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d3f63ad73bd0d26431e0610b41cb8dcc799b4610db10ed90bee12834646b609' 
  AND token = '+7wkbH5rC6asoJ9o1Uh0ab5KY7dDZ30WHFZQFimzotM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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