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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a474553f1cc44fb17444feaf476d723c429ecf91f05c590e7dd8f13d76e7b659' 
  AND token = 'qA80qp18qK0eIZryyC96aRB9CCyBTSGs4f7rr3wTPpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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