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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c052d961bf6337c9216aa04fcc24d784568770c05b42a155bbcbbe55bcc07740' 
  AND token = 'e3hg3BBO9PTh8cKfVPnxcVYALJoItXN4Q3m5h9rdDpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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