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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd659142a0d5b5a78f5fbc1a9d6ee0cbe56977a734870d7089774e2d292a77a2e' 
  AND token = 'fjjARb6lK0OEMn7l6W1jNu5SOJAh9BzcXhMpOu/1Xc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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