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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '314c4bd5a1085022eb09d67580210035e7a60533459895880d8bcc8d14cd8d08' 
  AND token = 'ej3WWcknFXGBs3F0mpkzkj+T3KK67lpeIvua0yhz4YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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